Here are the 10 early warning signs, anchored by the essential, easy-to-remember acronym BE FAST.
The BE FAST Method: The Core Sudden-Onset Signs
If you see or experience any single one of these sudden signs, call emergency services immediately. Do not wait to see if it passes.
| Letter | Sign | What to Look For |
|---|---|---|
| B | Balance | Sudden loss of balance or coordination, trouble walking, dizziness, or a sudden severe headache with no known cause. |
| E | Eyes | Sudden vision changes, like blurred or double vision, or a complete loss of vision in one or both eyes. |
| F | Face Drooping | One side of the face is numb or droops. Ask the person to smile. Is it uneven or lopsided? |
| A | Arm Weakness | One arm is suddenly weak or numb. Ask them to raise both arms. Does one arm drift downward? |
| S | Speech Difficulty | Speech is slurred, garbled, or the person can’t speak at all despite seeming awake. They may also have trouble understanding you. Ask them to repeat a simple sentence like “The sky is blue.” |
| T | Time to Call Emergency Services | If you spot any one of these signs, even if they go away, note the time the symptoms first started and call for an ambulance immediately. Do not drive them yourself unless absolutely necessary, as paramedics can begin life-saving care on the way. |
Beyond BE FAST: Other Crucial Warning Signs
These signs are often missed or explained away, especially in women, but they are equally critical.
6. Sudden, Severe “Thunderclap” Headache
This is not a normal tension headache. It’s often described as the “worst headache of your life,” striking instantly and severely with no known cause. This is a classic sign of a hemorrhagic stroke (a burst blood vessel).
7. Sudden Confusion and Trouble Understanding
The person may suddenly seem disoriented, not know where they are, or struggle to understand what you’re saying. You might think they’re just not listening, but their brain isn’t processing the language.
8. Sudden Nausea or Vomiting
While nonspecific on its own, when combined with other sudden balance, vision, or headache symptoms, acute nausea and vomiting can signal a stroke involving the brainstem or a hemorrhagic stroke.
9. Transient Ischemic Attack (TIA): The “Mini-Stroke” That’s a Major Warning
A TIA is a temporary blockage. The symptoms are identical to a full stroke but last only a few minutes or hours, then resolve completely. This is the most critical warning sign you can get. It’s a medical emergency, not a “funny spell.” A TIA means a major stroke is likely imminent—often within hours or days. Immediate medical treatment can prevent a catastrophic, disabling stroke.
10. Sudden Hiccups, Chest Pain, or Shortness of Breath (Especially in Women)
Women’s stroke symptoms can be more subtle and atypical. Sudden, uncontrollable hiccups, palpitations, chest pain, or a feeling of breathlessness, particularly when combined with any other neurological sign, are a red flag that is too often dismissed as anxiety or indigestion.
The Golden Rule: It’s Always an Emergency
The damage from a stroke is happening right now. Never say “let’s sleep on it” or “let’s see if it gets better.” A person having a stroke may be unable to use the phone themselves due to confusion or paralysis. If you are the witness, you must act for them.
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Call an ambulance immediately. Do not call a family member first.
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Note the time. The window for the most effective clot-busting drugs is often within 3 to 4.5 hours of the first symptom.
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Do not give them food, drink, or aspirin. They may have trouble swallowing, and you don’t know if the stroke is from a clot or a bleed (aspirin would make a bleed worse).
Share the BE FAST acronym with everyone you know. It’s a simple tool that makes an overwhelming emergency crystal clear.